Of course, although disagree with 'much' more effective.Raphinha would be much more effective than his is now if had an attacking RB and Dembele at LW... also if had a striker that could run in behind.
But doubt any of that happens anyway.
Dembele RW and Gavi LW has proven to be more stable than Dembele LW and Raphinha RW. Been a while since Dembele/Raphinha combo was tried but Dembele just isn't as effective to the left.
Rather play 4 mids than shoehorn Dembele and Raphinha.